Display screen or portion thereof with an animated graphical user interface



FIG. 1 is a front view of a first image in a sequence for a displayscreen or portion thereof with an animated graphical user interfaceshowing our new design;

FIG. 2 is a front view of a second image thereof; and,

FIG. 3 is a front view of a third image thereof.

The outermost broken line rectangle shows the display screen or portionthereof. All other broken lines show portions of the graphical userinterface and form no part of the claimed design.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-3. The process or period in whichone image transitions to another forms no part of the claimed design.

CLAIM We claim the ornamental design for a display screen or portionthereof with an animated graphical user interface, as shown anddescribed.